Environmental risks in the developing world: exposure indicators for evaluating interventions, programmes, and policies
M. Ezzati, J. Utzinger, S. Cairncross, A. Cohen, and B. Singer
J Epidemiol Community Health. 2005 January; 59(1): 15–22. doi: 10.1136/jech.2003.019471.PMCID: PMC1763362